CN205670717U - Long-life intelligent electric energy meter - Google Patents

Abstract

The utility model provides a long-life intelligent electric energy meter, which includes a power supply circuit. The power supply circuit includes a main power supply circuit and an emergency power supply circuit connected to each other. The electric energy meter function module provides power supply voltage for it, the main power supply circuit includes a main power supply circuit, the emergency power supply circuit includes a farad capacitor circuit and a lithium battery circuit, and the main power supply circuit is connected to the farad capacitor circuit and the lithium battery circuit respectively Connection, the main power supply circuit, the farad capacitor circuit and the lithium battery circuit are connected to the switching circuit, and the switching circuit is connected to the main control CPU of the smart electric energy meter. time, which can prolong the service life of lithium battery and reduce the cost of smart energy meter.

Description

Long life smart energy meter

technical field

The utility model relates to the field of intelligent electric energy meters, in particular to a long-life intelligent electric energy meter.

Background technique

The electric energy meter belongs to the electric energy metering equipment, and the smart electric energy meter adopts the method of rate measurement, and is required to have functions such as power failure display, load record and power failure meter reading, etc. Based on accurate timing. The current smart energy meter generally uses a lithium battery as an emergency power supply in a power failure state. The State Grid Corporation requires that the life of the electric energy meter is not less than 10 years, but the actual life of the lithium battery is far from meeting the requirements due to its complex characteristics. If the battery fails, it will cause a series of problems such as inaccurate clock movement and abnormal important data. At this time, the battery must be replaced. The replacement of the battery requires professional maintenance personnel to go to the site to disassemble and debug, which greatly increases the labor cost. At the same time, if the replaced battery is not handled properly, it will also cause serious environmental pollution. Prolonging the service life of the lithium battery in the smart energy meter can solve a bottleneck problem in the service life of the energy meter.

Utility model content

According to the deficiencies of the prior art, the utility model provides a long-life intelligent electric energy meter, which introduces a farad capacitor and effectively improves the service life of the lithium battery.

The technical scheme of the utility model: a long-life intelligent electric energy meter, characterized in that it includes a power supply circuit, the power supply circuit includes a connected main power supply circuit and an emergency power supply circuit, and the power supply circuits are respectively connected to the main control CPU and its peripheral circuit and intelligent electric energy meter function module provide power supply voltage for it, and described main power supply circuit comprises main power supply circuit, and described emergency power supply circuit comprises farad capacitance circuit and lithium battery circuit, and main power circuit is connected with farad respectively The capacitor circuit is connected to the lithium battery circuit, the main power supply circuit, the farad capacitor circuit and the lithium battery circuit are connected to the switch circuit, and the switch circuit is connected to the main control CPU of the smart electric energy meter.

The main power supply circuit is also connected to a power failure detection circuit, and the lithium battery circuit is connected to a voltage detection circuit.

The power supply circuit includes a first composite diode and a second composite diode, the main power supply is connected to the first resistor, the first resistor is connected to the first composite diode, the first composite diode is connected to the second resistor, and the second resistor is connected to the positive pole of the farad capacitor, The negative pole of the farad capacitor is grounded, the main power supply is also connected to the second compound diode, the second compound diode is connected to the first compound diode, the main control CPU is connected between the second compound diode and the first compound diode, and the main control CPU is connected to the patch TVS tube , the second composite diode is connected to the positive electrode of the lithium battery through the third resistor, and the negative electrode of the lithium battery is grounded.

During normal power supply, the Farad capacitor is charged by the main power supply through the first resistor, the first composite diode and the second resistor, the main power supply supplies power to the main control CPU through the first composite diode, and the Farad capacitor is charged through the first composite diode during a power failure. The second resistor and the first compound diode supply power to the main control CPU, and the lithium battery supplies power to the main control CPU through the third resistor and the second compound diode.

The technical effect of the utility model: the introduction of farad capacitors and lithium batteries in the smart electric energy meter is used as an emergency power supply when the electric energy meter is out of power, so as to ensure that the power consumption information can be accurately recorded in the power outage state, and functional requirements such as power outage meter reading can be realized . Farad capacitors have a long charge and discharge life, reduce the use time of lithium batteries, and prolong the service life of lithium batteries, thereby extending the life of smart energy meters to more than 20 years and reducing the cost of smart energy meters.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model smart electric energy meter;

Fig. 2 is a schematic diagram of the power supply structure of the utility model;

Fig. 3 is a structural diagram of the power supply circuit of the utility model.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figures 1 and 2, a long-life smart energy meter includes a power supply circuit 1, and the power supply circuit 1 includes a main power supply circuit 10 and an emergency power supply circuit 11 connected to each other, and the power supply circuits 1 are respectively connected to Main control CPU and its peripheral circuit 2 and intelligent electric energy meter function module 3 and provide power supply voltage for it, described main power supply circuit 10 comprises main power circuit 12, and described emergency power supply circuit 11 comprises farad capacitance circuit 13 and lithium battery Circuit 14, the main power supply circuit 12 are respectively connected with the farad capacitor circuit 13 and the lithium battery circuit 14, the main power supply circuit 12, the farad capacitor circuit 13 and the lithium battery circuit 14 are connected with the switching circuit 22, and the switching circuit 22 is connected with the main control of the smart electric energy meter The CPU 21 and the main power supply circuit 12 are also connected to a power failure detection circuit 15 , and the lithium battery circuit 14 is connected to a voltage detection circuit 16 .

As shown in Figure 3, the power supply circuit 1 includes a first composite diode D1 and a second composite diode D2, the main power supply VCC1 is connected to the first resistor R1, the first resistor R1 is connected to the first composite diode D1, and the first composite diode D1 is connected to The second resistor R2, the second resistor R2 is connected to the positive pole of the farad capacitor C1, the negative pole of the farad capacitor C1 is grounded, the main power supply VCC1 is also connected to the second composite diode D2, the second composite diode D2 is connected to the first composite diode D1, and the second composite diode The main control CPU21 is connected between D2 and the first composite diode D1, and the main control CPU21 is connected to the patch TVS tube D3. The second composite diode D2 is connected to the positive pole of the lithium battery BT1 through the third resistor R3, and the negative pole of the lithium battery BT1 is grounded. During normal power supply The Farad capacitor C1 is charged by the main power supply VCC1 through the first resistor R1, the first composite diode D1 and the second resistor R2, the main power supply VCC1 supplies power to the main control CPU21 through the first composite diode D2, and the Farad capacitor C1 is in the During power failure, the main control CPU 21 is powered by the second resistor R2 and the first compound diode D1, and the main control CPU 21 is powered by the lithium battery BT1 through the third resistor R3 and the second compound diode D2.

When the mains supply power, the main power supply circuit supplies power to the main control CPU and functional modules of the energy meter through the power supply switching circuit, and the main power supply is connected to the farad capacitor, and the farad capacitor is charged to the farad capacitor voltage when the main power supply is in the state of the main power supply. The power supply voltage is the same; when the mains power is cut off, the farad capacitor immediately supplies power to the main control CPU of the electric energy meter and the power failure-related functional modules through the switching circuit, until the passivation of the lithium battery power supply circuit is released, and the lithium battery power supply circuit is powered by the switching circuit and the farad capacitor At the same time, the circuit supplies power to the main control CPU of the electric energy meter and power failure related functional modules. The main power supply circuit is also connected to the main power failure detection circuit, and the lithium battery power supply circuit is also connected to a battery voltage detection circuit.

In the above technical solution, when the mains power supply is restored, the system immediately switches to the main power supply mode, and the main power supply circuit charges the farad capacitor until the charging is completed. The charging and discharging life of the farad capacitor is very long, which can reach 500,000 times or 200,000 hours, which can effectively prolong the service life of the smart meter and reduce the cost of the smart meter.

The power supply circuit in the above technical solution is composed of a farad capacitor C1, a lithium battery BT1, resistors R1-R3, composite diodes D1 and D2, and a patch TVS tube D3. In Figure 3, VCC1 is the operating voltage provided by the main power supply, and VCC_MCU is the operating voltage of the main control CPU and peripheral function modules. When the main power supply is supplied, the main power supply VCC1 provides the voltage VCC_MCU through the composite diode D2; at the same time, the main power supply VCC1 charges the farad capacitor C1 through the resistor R1, the composite diode D1 and the resistor R2 until the voltage of the GND terminal of the farad capacitor C1 is equal to that of the main power supply. The power supply VCC1 is basically the same; when the mains power is cut off, the farad capacitor C1 provides the voltage VCC_MCU first through the resistor R2 and the compound diode D1. At this time, the lithium battery BT1 is released from the passivation state and can provide emergency power normally. Resistor R3 and composite diode D2 provide voltage VCC_MCU; farad capacitor C1 and lithium battery BT1 work together as an emergency power supply to provide working voltage VCC_MCU. The above patch TVS tube D3 is a work protection tube for the main control CPU.

In the above technical solution, when the main power supply VCC1 is powered off, the smart energy meter enters the power-off state, and at this time, the emergency power supply provides power for the power-off functional module. When the lithium battery voltage is low, it will prompt that the battery voltage of the smart energy meter is insufficient, and it is necessary to remind the grid maintenance personnel to replace the battery in time.

The long-life intelligent electric energy meter of the utility model introduces farad capacitors and lithium batteries into the intelligent electric energy meter to cooperate with it as an emergency power supply when the electric energy meter is out of power, so as to ensure accurate recording of power consumption information in the power outage state, and to realize power outage meter reading and other functional requirements. The farad capacitor has a long charge and discharge life, reducing the use time of the lithium battery can prolong the service life of the lithium battery, thereby extending the life of the smart energy meter to more than 20 years and reducing the cost of the smart energy meter.

Claims (4)

1. a long-life intelligent electric energy meter, it is characterised in that: include power supply circuit (1), described power supply circuit (1) Including the main electricity circuit (10) being connected and emergency service power circuit (11), power supply circuit (1) connects respectively Master cpu and peripheral circuit (2) thereof and intelligent electric energy meter functional module (3) also provide supply voltage, described main power supply electricity for it Source circuit (10) includes that main power circuit (12), described emergency service power circuit (11) include farad capacitor circuit (13) and lithium Battery circuit (14), main power circuit (12) is connected with farad capacitor circuit (13) and lithium battery circuit (14) respectively, main electricity Source circuit (12), farad capacitor circuit (13) and lithium battery circuit (14) connect switching circuit (22), and switching circuit (22) connects The master cpu (21) of intelligent electric energy meter.

Long-life intelligent electric energy meter the most according to claim 1, it is characterised in that: described main power circuit (12) is also connected with Power-fail detection circuit (15), described lithium battery circuit (14) connects voltage detecting circuit (16).

Long-life intelligent electric energy meter the most according to claim 1, it is characterised in that: described power supply circuit (1) includes First compound diode (D1) and the second compound diode (D2), main electricity (VCC1) connects the first resistance (R1), and first Resistance (R1) connects the first compound diode (D1), and the first compound diode (D1) connects the second resistance (R2), the second resistance (R2) connecting farad capacitor (C1) positive pole, farad capacitor (C1) minus earth, main electricity (VCC1) is also connected with second and is combined Diode (D2), the second compound diode (D2) is connected with the first compound diode (D1), the second compound diode (D2) and the Connecting master cpu (21) between one compound diode (D1), master cpu (21) connects paster TVS pipe (D3), and second is combined two poles Pipe (D2) connects lithium battery (BT1) positive pole, lithium battery (BT1) minus earth through the 3rd resistance (R3).

Long-life intelligent electric energy meter the most according to claim 3, it is characterised in that: the described farad capacitor when normal power supply (C1) by main electricity (VCC1) through the first resistance (R1), the first compound diode (D1) and the second resistance (R2) be that it fills Electricity, main electricity (VCC1) is master cpu (21) power supply through the first compound diode (D2), and farad capacitor (C1) is when having a power failure Being master cpu (21) power supply through the second resistance (R2) and the first compound diode (D1), lithium battery (BT1) is through the 3rd resistance (R3) It is master cpu (21) power supply with the second compound diode (D2).